1, washing with detergent and hot water will make it easier to remove dirt.

2. Pour the alcohol into the oil, wipe it with a rag and remove the oil.

3. Rub the salt solution in the blackened place, and then wipe it off with a rag.

4. Wipe the blackened place with vinegar, but the baking tray will become thinner after washing, so don't use it for a long time.

5. Mix baking soda with hot water, and then clean the steel ball after it gets wet.

6, steel balls and detergent together to wipe the black place.

7. Soak some alkali in water and wipe it with a rag.